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840(4.4 v8) engine probs

Printed From: Bavarian-Board.co.uk - BMW Owners Discussion Forum
Category: Technical & Model Specific Forums
Forum Name: BMW 5 Series
Forum Discription: This forum will deal with any issues on the BMW 5 Series (E12, E28, E34, E39, E60 & E61)
URL: http://www.bavarian-board.co.uk/forum_posts.asp?TID=12996
Printed Date: 19-May-2024 at 20:53


Topic: 840(4.4 v8) engine probs
Posted By: 3.0csl
Subject: 840(4.4 v8) engine probs
Date Posted: 27-December-2004 at 20:13

Hi, i have a 98 840 sport in the uk and it has a strange problem. When the car is driven hard (kick down mode used etc)it affects the idle, it is lmpy as if there is a misfire. If the car is turned off and on again though it clears itself. Today however as I was trying to accelerate hard the car wouldn't produce and power and sounded rough. It has done 40kmiles and is genuine.

Any ideas?

Regards

Rohan Murphy



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Rohan Murphy

3.0 csl 2285146
3.0 csl 2275522


Replies:
Posted By: richard_tricky
Date Posted: 28-December-2004 at 12:24
dont know much about these engines. but have seen similar posts on here and they seem to point to the ignition coils (is'nt there one for each cylinder)?????? 

Posted By: 3.0csl
Date Posted: 28-December-2004 at 19:20

Richard,

 

having searched all the boards it seems you may be right, they have eight of them and the idea is to get the fault codes read and then change them and see if the misfire follows the coil. I have also seen a lot of people saying that the cats cause this but the car has only 42 k miles.

 

Regards

 

Rohan



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Rohan Murphy

3.0 csl 2285146
3.0 csl 2275522

Posted By: Jimmy
Date Posted: 29-December-2004 at 20:27
I would also check the camshaft sensor, this in turn sends the co way out and it gives all sorts of problems.

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Regards

Jimmy

98 528se Tourer
97 328 Sport
97 3.2 saloon
88 B10 # 77
85 B9
86 M5 3.6

http:\\www.e28club.com - www.e28club.com

Posted By: 3.0csl
Date Posted: 01-January-2005 at 20:14

Jimmy,

 

whats the story with the sensor? Is it easy to check/ change?

 

Regards

 

Rohan



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Rohan Murphy

3.0 csl 2285146
3.0 csl 2275522

Posted By: Jimmy
Date Posted: 01-January-2005 at 21:02
Its on the front of left bank if I remember right, you need to remove an air pipe to get at it, just a plug and play unit, my 540 was missing, stalling and uusing a fair amout of fuel, got the car read and it came back as "camshaft sensor" "lambada sensor" and one other which I have forgot!! anyway changed the cam sensor (as the guy that read the codes said the cam sensor will put all the other sensors out and give false readings) and it was like a new car, sensor was about £60 from dealer and it too 15 mins to fit just a flathead screwdriver and a 4-6mm allan key.

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Regards

Jimmy

98 528se Tourer
97 328 Sport
97 3.2 saloon
88 B10 # 77
85 B9
86 M5 3.6

http:\\www.e28club.com - www.e28club.com


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